Quote:
Originally Posted by Mike R
Welding of plates will NOT fix the issue any more than doing just the BMW repair, it is the exact same band-aid.
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Could you please stop suggesting that i ever said that plates only will fix it? I didn't, i said plates are for restrengthening the chassis, incase its been cracked, to former levels and the real fix to the issue are the solid bushings.
Quote:
Originally Posted by Mike R
The yawing motion of the bolts (more prevalent in SMG equipped cars due to the shockloading the automated gear changes in the faster modes transfer to the diff and hence the subframe mounts) is the issue and so you have to remove this.
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If you believe that some magical foam is able to stop any force induced by the brutal transmission shifts into the chassis, that is fine. I do not, or better said.. i don't trust that it will withstand this over time. Its a gamble... and if it fails its game over, because you will never get the foam out and any welding with the foam in place on the subframe is a serious fire hazard.
Quote:
Originally Posted by Mike R
Obviously anything else that helps lesson this movement is going to increase the amount of time it takes to re-occur, but not prevent it (so still a band-aid).
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Yes, but that is exactly what solid subframe bushings do. They tie the rear axle carrier to the subframe.. so there is ZERO movement. Thats the definition of solid.
Just look at what BMW did for the E92 M3. It has rubber subframe bushings from factory, just like the E46 M3. What have they done on the GTS? They used solid bushings.
@MisterCorn I don't know if the stock bushings allow YAW(Vertical) movement of the carrier but i don't think so. But its not the big problem for the subframe, its the lateral movement that the sheet metal can't handle.
Quote:
Originally Posted by MisterCorn
Unless somebody can provide evidence that a correctly torque subframe bolt is not stopping the subframe from moving, and that the subframe is held in place by the bolts being effectively used as dowels rather than clamps then I'm afraid I'm calling bullsh!t on the collars.
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I think thats the big question mark on these things, and probably the reason they are not very commonly known.